Download supply or feed connections must be flexible

SUPPLY CONNECTION CONSIDERATIONS:
WHEN NOT ABLE TO USE FLEXIBLE HOSE:
1.
All pipe connections should be flexible
so as not to restrain platform.
Containers usually require supply connections, for example for bringing the material into and taking it out of the container,
and for the electrical, hydraulic or pneumatic supply of the auxillary equipment on the container. These supply connections
can lead to vertical force restraints and must be flexible in both the horizontal and vertical direction to avoid weighing inaccuracies.
To avoid vertical force restraint, the best results are achieved with
hose connections in easily shaped hose materials.
2.
All pipe connections should preferrably
be attached toward the pivot side of
scale platform or tank.
When you are NOT able to use flexible hose, the following piping
considerations must be taken into account:
Figures 1 and 2
HORIZONTAL PIPE CONNECTIONS:
When rigid pipes are used without flexible interconnection it is advisable to connect the container (as shown in FIGURE 1)
via a piece of pipe which is horizontal and as long as possible, and must have stress compensation in the longitudinal
direction. The unsupported pipe should be a length at least 30 times the diameter of the pipe. The horizontal piece of pipe
has a spring action and becomes more flexible with increasing length. In accordance with FIGURE 2, instead of a
long horizontal pipe, one or more flexible couplings can be used. FIGURE 1 and 2 shows the structure of a
container system with flexible couplings in the pipe connection.
Figure 2
Flexible Pipe Coupling
Figures 3, 4 and 5
VERTICAL PIPE CONNECTIONS:
The open connection stub shown in FIGURE 3 gives the best solution as regards to reducing vertical force restraints,
and permits very accurate weighing equipments. With an open connection stub, contact between the pipe
connection and the container is avoided. A protective cover is advisable in all cases.
Figure 1
A further possibility of reducing undesired force restraints from the connection pipes involves using an elbow
as shown in FIGURE 5. It shows the design of a container system with an elbow connection, which allows for
a flexible "spring action" similar to FIGURE 1.
Long Pipe Connection
Tank
FIGURE 4 illustrates the arrangement of a mechanical compensator (metal bellows) and shows the equipment on
an upright container with pipe connections via metal belows. The use of a mechiancal compensator requires
relatively tight position tolerances. By using a second metal bellows linked to the first via a piece of piping, even
large tolerances can be compensated.
Scale Platform, Saddle or Legs
OTHER SUGGESTED FLEXIBLE COUPLING METHODS:
Pivot Point or
Platform Hinge
C.1.131
S.1.131
W.1.131
Load Cell
(Hydraulic or
Electronic)
Open Filler Stub
Figure 3
Compensator, Metal Bellows
Elbow Piping
Figure 4
Figure 5
Drawn by:
FORCE FLOW
FLOQUIP
1150-D Burnett Ave, Concord, CA 94520 USA
1-800-893-6723 US & Canada, Fax: 925-686-6713
www.forceflow.com / [email protected]
File: T4\O&M\ACCESSORY\FLEX.tcw (H07.pdf)
(WEB: H07.pdf)
SUPPLY CONNECTION
INSTRUCTIONS
Date:
SLP
Drawing Number
01/15/90
Revised:
01/31/01
Scale:
NONE
29906